JP2011093092A - Metal cutting circular saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a satisfactory cutting surface after cutting a workpiece, and to effectively suppress tip wear or fracture by decreasing frictional resistance of a side flank face during the cutting of the workpiece. <P>SOLUTION: In a metal cutting circular saw 30, saw teeth 32 are formed at certain intervals along the outer periphery of a disk-like base metal 31, and tips 34 are soldered on seat portions 33 of the saw teeth 32. The side flank face 35 of each tip 34 is divided into a first flank face 36 and a second flank face 37. The second flank face 37 is formed halfway in the range from an upper edge 34a to a lower edge 34b of the tip 34 in the diameter direction Y of the circular saw 30, and is formed from a rear edge 34c to a portion adjacent to a front edge 34d in the back-and-forth direction Z of the tip 34. The rest is the first flank face 36. The height of second flank face 37 in the thickness direction X of the base metal 31 is formed lower than the first flank face 36. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a circular saw used for cutting a metal material such as a steel pipe.

As shown in FIG. 2, a metal having a sawtooth (52) integrally formed on the outer periphery of a disk-shaped base metal (51) and a chip (54) brazed to a pedestal (53) of the sawtooth (52). As for the circular saw for cutting (50), when the side relief surface (56) of the tip (54) is polished, the circular saw (50) is usually moved in the direction of arrow A (rake direction) as shown in FIGS. On the other hand, a cup grindstone (55) that rotates in the opposite direction to the circular saw (50) was brought into contact with both sides of the tip (54) of the circular saw (50). Then, as shown in FIG. 5, this grinding process forms a lateral relief surface (56) of the tip (54). When the workpiece is cut by the circular saw (50), the circular saw (50) As a result, the saw blade (52) was less shaken in the left-right direction, and as a result, the cutting surface of the workpiece was less rough and good cutting was possible.

  However, in the case of the tip (54) polished by the cup grindstone (55) described above, as shown in FIG. 6, the tip (54) has an inclination (B) in the diameter direction of the circular saw (50). However, as shown in FIG. 7, there is a problem that the tip (54) cannot be inclined in the rotational direction (e) of the circular saw (50).

  Further, in the case of the circular saw (50), although it is possible to cut the work material well, since the frictional resistance of the lateral flank (56) when cutting the work material is large, the wear of the tip (54) and There was a problem that chipping was likely to occur and the life of the chip (54) was short.

In order to cope with such a problem, there is also known a circular saw having a chip provided with a recess extending from a rear end to a front end portion at a corner portion formed by an outer peripheral flank and a lateral flank.
JP 2002-1614

  However, in the case of the circular saw described above, it is easy for unwanted material such as brazing material to enter the recess of the chip, and when the chip is worn and the chip is re-polished, the recess disappears. Later, there was a problem that the effect of preventing wear or chipping of the chip due to the depression could not be obtained.

  The object of the present invention is to obtain a good cut surface after cutting the work material and reduce the frictional resistance of the side flank surface during cutting of the work material, thereby effectively causing chip wear and chipping. An object of the present invention is to provide a circular saw for metal cutting which can be suppressed and can obtain the same effect even after re-polishing of a chip.

  In the first aspect of the present invention, in a circular saw for metal cutting in which saw teeth are formed at regular intervals around the outer periphery of the disk-shaped base metal, and the chips are fixed to the saw teeth, the side clearance surface of the chips is the first. The flank is divided into a flank and a second flank, and the second flank is formed halfway from the upper edge to the lower edge in the diameter direction of the base metal. The remaining portion is the first flank, and the second flank is formed such that the height of the base metal in the thickness direction is lower than the first flank.

  The present invention according to claim 2 is the circular saw for cutting metal according to claim 1, wherein the width of the portion located on the front side of the second flank of the first flank is 0.1 to 1.0 mm. It is characterized by being.

  The front and rear direction of the side clearance surface is based on the rotation direction of the circular saw, the front indicates the rotation direction of the circular saw (rake direction), and the rear indicates the direction opposite to the rotation direction of the circular saw. And

  In the circular saw for cutting metal according to claim 1 of the present application, the second flank is formed lower than the first flank in the thickness direction of the base metal. Since the first flank that comes into contact with the material stably contacts the workpiece, there is less vibration of the saw blade in the left-right direction, resulting in a less rough cutting surface, and the second flank is the thickness of the base metal. Since it is formed lower than the first flank in the vertical direction, the frictional resistance of the side flank during cutting of the work material is also reduced, so that wear and chipping of the tip are effectively prevented, so that the life of the tip is reduced. become longer. Moreover, according to the circular saw according to the present invention, the configuration of the first flank and the second flank in the lateral flank is maintained as it is even after the chip is worn and re-polished. There is a particular advantage that the various effects described above can be obtained even after re-polishing.

  In the invention according to claim 2 of the present application, with respect to the circular saw according to claim 1, the whole or part of the width of the first flank is in the range of 0.1 to 1.0 mm. When the width is less than 0.1 mm, the saw blades are greatly shaken in the left-right direction, and the roughening of the cut surface becomes remarkable. On the other hand, when the width exceeds 1.0 mm, the workpiece is cut. This is because the wear resistance and chipping of the chip become remarkable.

  Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to such embodiments, and various modifications can be made within the scope of the gist.

As shown in FIG. 1, in the circular saw (30), saw teeth (32) are formed at regular intervals on the outer periphery of a disk-shaped base metal (31), and a tip (33) is formed on a pedestal (33) of the saw blade (32). 34) is brazed, but in this embodiment, the lateral flank (35) of the tip (34) is divided into a first flank (36) and a second flank (37). The flank (37) is formed from the upper edge (34a) to the lower edge (34b) of the tip (34) in the diameter direction (Y) of the circular saw (30). (Z) is formed from the rear edge (34c) to the portion closer to the front edge (34d), the remaining part is the first flank (36), and the second flank (37) The height of the gold (31) in the thickness direction (arrow X direction) is lower than that of the first flank (36). More specifically, the second flank (37) is a rectangular flat surface and has a structure that is one step lower than the first flank (36). Moreover, in this embodiment, the width (W1) of the part located in the front side of the 2nd flank (37) among the 1st flank (36) is 0.1-1.0 mm.

The circular saw according to the present invention can be widely used for cutting various metal materials because a good cut surface can be obtained while effectively preventing chip wear and chipping.

It is an expansion perspective view of the sawtooth part of the circular saw which concerns on other embodiment. It is an expansion perspective view of the sawtooth part in the conventional circular saw. It is a front view which shows the grinding | polishing state of the chip | tip in the conventional circular saw. It is a front view which similarly shows the grinding | polishing state of a chip | tip. It is an enlarged side view of the sawtooth part in the conventional circular saw. It is the enlarged front view of a sawtooth part similarly. It is the enlarged plan view of a sawtooth part similarly.

(31) Disc-shaped base metal
(32) Sawtooth
(33) Pedestal
(34) Chip
(35) Side flank
(36) First flank
(37) Second flank
(38) Ring whetstone
(30) Circular saw

Claims (2)

  In a circular saw for metal cutting in which saw blades are formed at regular intervals on the outer periphery of a disk-shaped base metal, and chips are fixed to the saw teeth, the lateral clearance surfaces of the chips are divided into first and second clearance surfaces. The second flank is formed from the upper edge to the lower edge in the diameter direction of the base metal, and is formed from the rear edge to the front edge portion in the longitudinal direction of the chip, and the remaining portion. Is a first flank, and the second flank is a circular saw for metal cutting in which the height of the base metal in the thickness direction is lower than that of the first flank.   The circular saw for metal cutting according to claim 1, wherein a width of a portion of the first flank located on the front side of the second flank is 0.1 to 1.0 mm.

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